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<div class="titlepage"><div><div><h4 class="title">
<a name="spirit.lex.quick_reference.lexers"></a><a class="link" href="lexers.html" title="Primitive Lexer Components">Primitive Lexer
        Components</a>
</h4></div></div></div>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Expression
                  </p>
                </th>
<th>
                  <p>
                    Attribute
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">ch</span></code>
                  </p>
                </td>
<td>
                  <p>
                    n/a
                  </p>
                </td>
<td>
                  <p>
                    Matches <code class="computeroutput"><span class="identifier">ch</span></code>
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">char_</span><span class="special">(</span><span class="identifier">ch</span><span class="special">)</span></code>
                  </p>
                </td>
<td>
                  <p>
                    n/a
                  </p>
                </td>
<td>
                  <p>
                    Matches <code class="computeroutput"><span class="identifier">ch</span></code>
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">str</span></code>
                  </p>
                </td>
<td>
                  <p>
                    n/a
                  </p>
                </td>
<td>
                  <p>
                    Matches regular expression <code class="computeroutput"><span class="identifier">str</span></code>
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">string</span><span class="special">(</span><span class="identifier">str</span><span class="special">)</span></code>
                  </p>
                </td>
<td>
                  <p>
                    n/a
                  </p>
                </td>
<td>
                  <p>
                    Matches regular expression <code class="computeroutput"><span class="identifier">str</span></code>
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">token_def</span><span class="special">&lt;</span><span class="identifier">Attrib</span><span class="special">&gt;</span></code>
                  </p>
                </td>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">Attrib</span></code>
                  </p>
                </td>
<td>
                  <p>
                    Matches the immediate argument
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">a</span> <span class="special">|</span>
                    <span class="identifier">b</span></code>
                  </p>
                </td>
<td>
                  <p>
                    n/a
                  </p>
                </td>
<td>
                  <p>
                    Matches any of the expressions <code class="computeroutput"><span class="identifier">a</span></code>
                    or <code class="computeroutput"><span class="identifier">b</span></code>
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">l</span><span class="special">[</span><span class="identifier">fa</span><span class="special">]</span></code>
                  </p>
                </td>
<td>
                  <p>
                    Attribute of <code class="computeroutput"><span class="identifier">l</span></code>
                  </p>
                </td>
<td>
                  <p>
                    Call semantic action <code class="computeroutput"><span class="identifier">fa</span></code>
                    (after matching <code class="computeroutput"><span class="identifier">l</span></code>).
                  </p>
                </td>
</tr>
</tbody>
</table></div>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
            The column <span class="emphasis"><em>Attribute</em></span> in the table above lists the
            parser attribute exposed by the lexer component if it is used as a parser
            (see Attribute). A 'n/a' in this columns means the lexer component is
            not usable as a parser.
          </p></td></tr>
</table></div>
</div>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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